package xml.parse;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import java.io.FileInputStream;

import java.util.ArrayList;

import java.util.List;

public class XmlParseUtil {

//输入一个xml文件的路径名，得到一个List<>

public List<Dog> parseXmlToList(String fileName) throws Exception {

//Dom方式解析：入口

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

DocumentBuilder builder = factory.newDocumentBuilder();

//准备输入流，为parse()做准备

//解析为可以用java处理的document对象

Document document = builder.parse(new FileInputStream(fileName));

Element element = document.getDocumentElement();//获取文当的结点

NodeList nodeList = element.getElementsByTagName("dog");//获取dog结点

List<Dog> dogs=new ArrayList<>();

for (int i = 0; i < nodeList.getLength(); i++) {

//获取每一个dog

Element dogElement = (Element)nodeList.item(i);

//获取dog的id属性

Dog dog=new Dog();

int id = Integer.parseInt(dogElement.getAttribute("id"));

dog.setId(id);

//获取dog的子节点

NodeList childNodes = dogElement.getChildNodes();

for(int j=0;j<childNodes.getLength();j++)

{

Node item = childNodes.item(j);

//只拿<zxx>形式的子节点

if(item.getNodeType()==Node.ELEMENT_NODE) {

if (item.getNodeName().equals("name")) {

String name = item.getFirstChild().getNodeValue();

dog.setName(name);

} else if (item.getNodeName().equals("score")) {

int score = Integer.parseInt(item.getFirstChild().getNodeValue());

dog.setScore(score);

} else {

int level = Integer.parseInt(item.getFirstChild().getNodeValue());

dog.setLevel(level);

}

}

}

dogs.add(dog);

}

return dogs;

}

}